Prototypes for Acura’s second-generation NSX are currently being tested at the Nürburgring, with one of the cars even burning to ground in late July. Despite the setback, Acura is confident the new NSX will be ready for launch in 2015 and that it will meet some pretty lofty goals set by the company.

The current Mercedes-Benz M-Class first arrived as a 2012 model, and soon the popular luxury SUV will receive a mid-cycle update. These are the newest spy shots of a prototype for the updated SUV, which we expect to be launched on the market next year, as a 2016 model.

Start-stop systems have finally started to arrive on U.S. new cars in noticeable numbers. The systems, which simply turn off a car's engine when it's sitting stationary and then switch it back on as the driver's foot starts to lift off the brake, are now fitted to 7 percent of new cars sold in the U.S.